Pierre-Henri Vermorel, Francois Lintz, Enrico Pozzessere, Emily Luo, Mark Easley, Wolfram Grün, Cesar de Cesar Netto
{"title":"Subtalar joint dynamics in progressive collapsing foot deformity: A cross-sectional progression model.","authors":"Pierre-Henri Vermorel, Francois Lintz, Enrico Pozzessere, Emily Luo, Mark Easley, Wolfram Grün, Cesar de Cesar Netto","doi":"10.1016/j.fas.2026.09.007","DOIUrl":"https://doi.org/10.1016/j.fas.2026.09.007","url":null,"abstract":"<p><strong>Background: </strong>Peritalar subluxation (PTS) contributes to progressive collapsing foot deformity (PCFD), yet its pathophysiology remains unclear. This study analyzed subtalar joint (SJ) dynamics throughout deformity progression.</p><p><strong>Methods: </strong>A retrospective review of 153 WBCT scans classified PCFD into four stages: (1) no PTS, (2) PTS without impingement, (3) PTS with sinus tarsi impingement (STI), and (4) PTS with subfibular impingement (SFI). Three-dimensional measurements of middle facet subluxation and incongruence, foot-ankle offset, SJ offset, and lateral process offset were compared between groups.</p><p><strong>Results: </strong>Progression to PTS was characterized by internal talar rotation relative to the foot tripod. Progression to STI demonstrated medial talar translation and subtalar valgus opening. After STI onset, deformity progressed, with a shift in the center of rotation from the middle facet to the lateral talar process.</p><p><strong>Conclusion: </strong>Internal talar rotation initiates PTS, while STI marks a turning point where collapse shifts toward the lateral talar process.</p><p><strong>Level of evidence: </strong>Level 3 retrospective comparative study.</p>","PeriodicalId":48743,"journal":{"name":"Foot and Ankle Surgery","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148971874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lolita Micicoi, Wolfram Grün, Emily Luo, Anna Bryniarski, Enrico Pozzessere, Viren Umrethiya, Pierre-Henri Vermorel, François Lintz, Cesar de Cesar Netto
{"title":"Which factors are associated with failure of conservative treatment in progressive collapsing foot deformity?","authors":"Lolita Micicoi, Wolfram Grün, Emily Luo, Anna Bryniarski, Enrico Pozzessere, Viren Umrethiya, Pierre-Henri Vermorel, François Lintz, Cesar de Cesar Netto","doi":"10.1016/j.fas.2026.09.002","DOIUrl":"https://doi.org/10.1016/j.fas.2026.09.002","url":null,"abstract":"<p><strong>Background: </strong>Progressive collapsing foot deformity (PCFD) has a variable course, with over 10% of patients progressing to surgery despite nonoperative treatment.</p><p><strong>Methods: </strong>Adults with PCFD initially treated nonoperatively and baseline weight-bearing CT were retrospectively stratified into nonoperative and surgical groups. Demographics, PROMIS, and WBCT alignment were compared.</p><p><strong>Results: </strong>Seventy-six feet were analyzed. Progression to surgery was associated with greater baseline hindfoot malalignment (Foot-Ankle Offset 9.0 ± 3.1 vs 6.6 ± 3.0, p = 0.046; Hindfoot Moment Arm p = 0.008), male sex (p = 0.008), and higher BMI (32.1 ± 7.3 vs 26.8 ± 5.2, p = 0.044). PROMIS and forefoot alignment did not discriminate outcomes.</p><p><strong>Conclusion: </strong>In this exploratory cohort, a more valgus hindfoot alignment, male sex, and higher BMI emerged as potential predictors of failure of nonoperative treatment in PCFD, whereas baseline pain and physical function did not discriminate outcomes. These candidate factors warrant confirmation in larger, adequately powered studies before WBCT-derived alignment parameters can be used for risk stratification.</p><p><strong>Level of evidence: </strong>Level III - Retrospective comparative study.</p>","PeriodicalId":48743,"journal":{"name":"Foot and Ankle Surgery","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148945936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Woo Sub Kim, Dongjae Jeong, Moon Seok Park, Ki Hyuk Sung
{"title":"Multi-segment foot kinematics in talocalcaneal coalition: A radiologically matched case-control study.","authors":"Woo Sub Kim, Dongjae Jeong, Moon Seok Park, Ki Hyuk Sung","doi":"10.1016/j.fas.2026.09.004","DOIUrl":"https://doi.org/10.1016/j.fas.2026.09.004","url":null,"abstract":"<p><strong>Background: </strong>Talocalcaneal (TC) coalition restricts subtalar motion and frequently coexists with hindfoot deformity, which may confound gait kinematic assessment. We evaluated multi-segment foot kinematics in TC coalition after controlling for deformity severity through radiological matching.</p><p><strong>Methods: </strong>Eighteen feet with TC coalition were matched 1:1 to no-coalition controls using anteroposterior talus-2nd metatarsal and lateral talus-1st metatarsal angles via Hungarian algorithm caliper matching. Multi-segment foot kinematics were compared using Welch's t-tests.</p><p><strong>Results: </strong>Demographic and radiographic characteristics were balanced between groups. Hindfoot, forefoot, and hallux kinematics did not differ significantly between groups (all p > 0.10). However, arch length range during gait was significantly reduced in TC coalition (15.1 ± 2.7 vs. 18.1 ± 3.2 mm; p = 0.005, Cohen's d = -1.01).</p><p><strong>Conclusions: </strong>After controlling for deformity severity, TC coalition was associated with reduced dynamic arch length range, while composite hindfoot kinematics were preserved, consistent with tibiotalar compensation for restricted subtalar motion.</p>","PeriodicalId":48743,"journal":{"name":"Foot and Ankle Surgery","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148931720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alp Er Tunga Bolukbasi, Onur Kocadal, Burak Cagri Aksu, Korcan Yuksel, Kaan Yardimci
{"title":"The effect of tibial rotational deformity on ankle joint loadings: A finite element analysis.","authors":"Alp Er Tunga Bolukbasi, Onur Kocadal, Burak Cagri Aksu, Korcan Yuksel, Kaan Yardimci","doi":"10.1016/j.fas.2026.09.005","DOIUrl":"https://doi.org/10.1016/j.fas.2026.09.005","url":null,"abstract":"<p><strong>Background: </strong>Tibial shaft fractures are common, and malrotation is a frequent complication after intramedullary nailing. This study evaluated the effect of tibial malrotation on ankle joint loading using finite element analysis.</p><p><strong>Methods: </strong>Finite element models were created from Visible Human Project CT data. A distal one-third transverse tibial shaft fracture was fixed with an intramedullary nail. Seven models were analyzed: neutral, 5°, 15°, and 25° internal rotation (IR), and 5°, 15°, and 25° external rotation (ER). A 2500 N axial load was applied, and tibiotalar cartilage and implant stresses were assessed.</p><p><strong>Results: </strong>Tibiotalar cartilage loading increased with malrotation, peaking in the 25° IR model. Internal rotation consistently produced greater stresses than equivalent external rotation.</p><p><strong>Conclusion: </strong>Tibial malrotation increases ankle cartilage loading after intramedullary nailing. Internal rotation causes greater biomechanical changes than external rotation and may increase the risk of ankle arthrosis.</p>","PeriodicalId":48743,"journal":{"name":"Foot and Ankle Surgery","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148945907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Riccardo Garibaldi, John E Lama, Jensen K Henry, Ranqing Lan, Constantine A Demetracopoulos, Scott J Ellis
{"title":"Accuracy of implant positioning in total ankle arthroplasty using patient-specific instrumentation: A weightbearing CT analysis of landmark-based parameters.","authors":"Riccardo Garibaldi, John E Lama, Jensen K Henry, Ranqing Lan, Constantine A Demetracopoulos, Scott J Ellis","doi":"10.1016/j.fas.2026.09.001","DOIUrl":"https://doi.org/10.1016/j.fas.2026.09.001","url":null,"abstract":"<p><strong>Background: </strong>Patient-specific instrumentation (PSI) may improve implant positioning in total ankle arthroplasty (TAA), but three-dimensional validation with postoperative weightbearing CT (WBCT) remains limited. This study assessed the accuracy of the INBONE Prophecy system.</p><p><strong>Methods: </strong>Fifty-four patients undergoing INBONE II TAA with available Prophecy planning and postoperative WBCT were retrospectively reviewed. Planned and postoperative implant positions were compared for medial tibial component-to-medial malleolus distance, talar stem-to-subtalar joint distance, and talar cut relative to the horizontal axis. Reliability was evaluated using intraclass correlation coefficients.</p><p><strong>Results: </strong>Distance measurements showed high accuracy, with most cases within 1 mm. Poor accuracy (>2 mm) occurred in 20% of medial malleolar and 7.7% of subtalar measurements. ICCs ranged from 0.79 to 0.95. The mean absolute angular difference for talar cut was 2.91°.</p><p><strong>Conclusion: </strong>INBONE Prophecy PSI accurately reproduced planned distance-based positioning, while sagittal talar alignment was more variable.</p>","PeriodicalId":48743,"journal":{"name":"Foot and Ankle Surgery","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148921441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Karan Malhotra, George Matheron, Aditi Aggarwal, Shelain Patel, Nicholas Cullen, Matthew Welck
{"title":"Clinical determination of forefoot morphotypes in flexible Charcot-Marie-Tooth cavovarus feet - A novel system of clinical examination.","authors":"Karan Malhotra, George Matheron, Aditi Aggarwal, Shelain Patel, Nicholas Cullen, Matthew Welck","doi":"10.1016/j.fas.2026.08.012","DOIUrl":"https://doi.org/10.1016/j.fas.2026.08.012","url":null,"abstract":"<p><strong>Background: </strong>Cavovarus foot morphology varies significantly, necessitating bespoke treatment. Four distinct forefoot morphotypes have been described which may aid surgical planning. This study assesses whether clinical examination can accurately assess forefoot morphotype.</p><p><strong>Methods: </strong>Retrospective, single-centre study including 60 CMT cavovarus feet. Feet were categorised clinically into four previously described morphotypes by two clinicians. Clinical findings were compared to software-based categorisation of weightbearing CT images (30 feet).</p><p><strong>Results: </strong>Inter-rater reliability was 0.943 for clinical versus software; 0.938 between clinicians. 60% were Type 1, 21.7% Type 2, 10% Type 3 and 8.3% Type 0. Three distinct subtypes of Type 3 were noted: Balanced (pure adduction), Plantarflexed (additional plantarflexion of first ray) and Pronated (additional pronation of whole forefoot). Eleven Type 1/2 feet had an Adduction subtype.</p><p><strong>Conclusion: </strong>Cavovarus foot morphology can be reliably identified on clinical examination. This may aid decision making for surgeons without access to weightbearing CT or specialised software.</p>","PeriodicalId":48743,"journal":{"name":"Foot and Ankle Surgery","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148931734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Brecht Van Der Velden, Jed Campbell, Bhavin Jadav, Job Doornberg, Ruurd Jaarsma
{"title":"Unilateral CT systematically overestimates syndesmotic malreduction: Clinical implications of bilateral CT assessment after ankle fracture fixation.","authors":"Brecht Van Der Velden, Jed Campbell, Bhavin Jadav, Job Doornberg, Ruurd Jaarsma","doi":"10.1016/j.fas.2026.09.003","DOIUrl":"https://doi.org/10.1016/j.fas.2026.09.003","url":null,"abstract":"<p><strong>Background: </strong>Bilateral computed tomography (CT) accounts for patient-specific anatomical variation in postoperative syndesmotic assessment, but unilateral CT remains common.</p><p><strong>Methods: </strong>This retrospective single-center cohort study included 144 patients who underwent ankle fracture fixation with syndesmotic stabilization and postoperative bilateral low-dose CT. Paired unilateral and bilateral classifications based on validated CT criteria were compared using McNemar's test.</p><p><strong>Results: </strong>Classification differed in 21 of 144 cases (14.6%). Relative to bilateral assessment, unilateral CT overestimated malreduction in 17 cases (11.8%) and missed malreduction in 4 cases (2.8%). Interobserver agreement was substantial (κ = 0.795).</p><p><strong>Conclusions: </strong>Unilateral CT more often classified syndesmotic reduction as malreduced than bilateral CT. Bilateral low-dose CT may improve interpretation when revision surgery is being considered.</p><p><strong>Levels of evidence: </strong>Level III.</p>","PeriodicalId":48743,"journal":{"name":"Foot and Ankle Surgery","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148931714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Silviya Ivanova, Yann Bieri, Fabian Krause, Thomas Lustenberger, Helen Anwander
{"title":"Accessibility of the talus through an anterior arthrotomy for treatment of osteochondral lesions using autologous matrix-induced chondrogenesis.","authors":"Silviya Ivanova, Yann Bieri, Fabian Krause, Thomas Lustenberger, Helen Anwander","doi":"10.1016/j.fas.2026.08.013","DOIUrl":"https://doi.org/10.1016/j.fas.2026.08.013","url":null,"abstract":"<p><strong>Background: </strong>Open treatment of osteochondral lesions of the talus (OLTs) using autologous matrix-induced chondrogenesis (AMIC) may require malleolar osteotomy for exposure. This study analysed which OLT locations can be accessed through an anterior arthrotomy without osteotomy.</p><p><strong>Methods: </strong>Fifty patients undergoing AMIC were retrospectively analysed. Lesion location was measured on MRI as the distance from the anterior cartilage margin to the posterior lesion border relative to talar dome length. Receiver operating characteristic analysis identified the optimal cut-off for predicting osteotomy.</p><p><strong>Results: </strong>Anterior arthrotomy was sufficient in 70% of cases. Lesions treated without osteotomy were more anterior than those requiring osteotomy (65 ± 13% versus 79 ± 11%; p < 0.001). The optimal cut-off was 73.3% (area under the curve, 0.821), with 80.0% sensitivity and 82.9% specificity. Posteromedial lesions showed the highest osteotomy rate.</p><p><strong>Conclusions: </strong>During AMIC, lesions confined to the anterior three quarters of the talar dome can generally be treated without osteotomy, whereas posterior extension increases osteotomy likelihood.</p>","PeriodicalId":48743,"journal":{"name":"Foot and Ankle Surgery","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148983957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lolita Micicoi, Wolfram Grün, Barbara Piclet-Legre, Enrico Pozzessere, Cesar de Cesar Netto, Jean-François Gonzalez
{"title":"The 50 most-cited articles on Lisfranc injuries: A bibliometric analysis.","authors":"Lolita Micicoi, Wolfram Grün, Barbara Piclet-Legre, Enrico Pozzessere, Cesar de Cesar Netto, Jean-François Gonzalez","doi":"10.1016/j.fas.2026.08.014","DOIUrl":"https://doi.org/10.1016/j.fas.2026.08.014","url":null,"abstract":"<p><strong>Purpose: </strong>Lisfranc injuries are bony and ligamentous disruptions of the tarsometatarsal joint complex associated with significant morbidity, and several aspects of their management remain controversial. To our knowledge, no citation analysis dedicated to Lisfranc injuries has been published.</p><p><strong>Methods: </strong>The Web of Science Core Collection was searched on May 1, 2026. After document-type and language filters, articles were sorted by citation count, and two reviewers screened the top 100 records to identify the 50 most-cited articles primarily focused on Lisfranc injuries.</p><p><strong>Results: </strong>The 50 articles accumulated 4911 citations (mean 98.2 ± 51.5; range 49-274) and were published between 1973 and 2020. Foot & Ankle International was the most prolific journal (28%), and the United States contributed 64% of articles. Eighty percent were Level IV-V evidence; only 6% were Level I-II.</p><p><strong>Conclusion: </strong>Higher-quality comparative trials are needed to address persistent controversies, particularly regarding optimal surgical management.</p><p><strong>Level of evidence: </strong>Level V (bibliometric analysis).</p>","PeriodicalId":48743,"journal":{"name":"Foot and Ankle Surgery","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148892624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B Lau, A Newton, T L Lewis, V Vignaraja, S Franklin, S Trowbridge, J Ayathamattam, P Lam, R Ray
{"title":"The association between surgeon grade and clinical outcome in fourth-generation minimally invasive hallux valgus surgery.","authors":"B Lau, A Newton, T L Lewis, V Vignaraja, S Franklin, S Trowbridge, J Ayathamattam, P Lam, R Ray","doi":"10.1016/j.fas.2026.08.011","DOIUrl":"https://doi.org/10.1016/j.fas.2026.08.011","url":null,"abstract":"<p><strong>Background: </strong>Fourth-generation minimally invasive techniques for hallux valgus correction have demonstrated positive clinical outcomes. However, incorporation into orthopaedic training remains unexplored. This study evaluated whether orthopaedic trainees, operating under direct supervision of an experienced MIS surgeon, achieve comparable outcomes to consultant-performed procedures.</p><p><strong>Methods: </strong>A retrospective study of 100 MIS hallux valgus corrections compared consultant-performed (n = 50) and trainee-performed (n = 50) groups. Radiographic parameters (HVA, IMA, DMAA) and PROMs (MOXFQ, EQ-5D-5L) were compared.</p><p><strong>Results: </strong>47 consultant and 49 trainee procedures were analysed. Both groups demonstrated significant improvement in all radiographic parameters, MOXFQ and EQ-5D-5L index (P < 0.01). No significant differences were observed between consultant- and trainee-performed groups for postoperative HVA, IMA, MOXFQ, or EQ-5D-5L scores (P > 0.05). Complication rates were comparable (12 each, P > 0.05).</p><p><strong>Conclusion: </strong>Trainees performing MIS hallux valgus correction under direct supervision achieved comparable radiographic correction, patient-reported outcomes, and complication rates to those of a consultant surgeon.</p><p><strong>Level of evidence: </strong>Level III, Comparative study.</p>","PeriodicalId":48743,"journal":{"name":"Foot and Ankle Surgery","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148907166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}